Book/Dissertation / PhD Thesis

FZJ-2018-00468

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mechanical Characterization of Solid Oxide Fuel Cells and Sealants

Wei, J. (Corresponding author)FZJ*

2017
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-266-5

Please use a persistent id in citations: http://hdl.handle.net/2128/17588

Abstract: Solid oxide fuel cells (SOFCs) have a high application potential due to the evolved demands in a global energy network. Characterization of thermo-mechanical aspects, in particular elastic, fracture and creep behavior of sealants and anode substrates, is essential to warrant reliable production and operation of planar SOFCs. In this respect, several mechanical parameters have been determined and analyzed to get insight into the mechanical behavior and possible issues for joining, thermal cycling and long term reliability of SOFC stacks and systems. For anode substrates, facture toughness and creep behavior as major mechanical aspects were studied. In this respect, the room and elevated temperature fracture toughness of two typical anode substrate variants (NiO-3YSZ and NiO-8YSZ) were characterized in oxidized and reduced state, some selected tests were concluded for a re-oxidized state. Elevated temperature creep studies concentrated on Ni-8YSZ composites with different porosities, where different loading configurations have been compared to assess effects of compressive and tensile stresses. The interpretation and analysis of the data were based on analytical and finite element analysis. Leakage of sealants will lead to a malfunction of the entire system, hence the structural integrity of sealants is crucial for a reliable operation of SOFC stacks and systems. In particular, Ag particle and YSZ fiber reinforced sealants, based on a glass matrix material developed in Jülich, were studied in stack operation relevant as-sintered and annealed state. Sealants supplied by Ceramics and Glass Institute (CSIC, Madrid, Spain) were also characterized and compared. Work concentrated on characterization of fracture stress at elevated temperatures on specimens mainly in a head-to-head geometry and complementary torsion tests to investigate the shear strength. The results of mechanical analysis were supported by advanced microstructural characterization and fractography to gain insight into annealing and filler reinforcement effects.

Note: RWTH Aachen, Diss., 2016

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

Appears in the scientific report 2018

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Database coverage:
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